diff options
Diffstat (limited to 'src/math/erfl.c')
| -rw-r--r-- | src/math/erfl.c | 54 |
1 files changed, 25 insertions, 29 deletions
diff --git a/src/math/erfl.c b/src/math/erfl.c index a80c2ce1..f7449859 100644 --- a/src/math/erfl.c +++ b/src/math/erfl.c @@ -108,9 +108,6 @@ long double erfl(long double x) #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 static const long double tiny = 1e-4931L, -half = 0.5L, -one = 1.0L, -two = 2.0L, /* c = (float)0.84506291151 */ erx = 0.845062911510467529296875L, @@ -248,12 +245,12 @@ long double erfl(long double x) int32_t ix, i; uint32_t se, i0, i1; - GET_LDOUBLE_WORDS (se, i0, i1, x); + GET_LDOUBLE_WORDS(se, i0, i1, x); ix = se & 0x7fff; if (ix >= 0x7fff) { /* erf(nan)=nan */ i = ((se & 0xffff) >> 15) << 1; - return (long double)(1 - i) + one / x; /* erf(+-inf)=+-1 */ + return (long double)(1 - i) + 1.0 / x; /* erf(+-inf)=+-1 */ } ix = (ix << 16) | (i0 >> 16); @@ -272,7 +269,7 @@ long double erfl(long double x) return x + x * y; } if (ix < 0x3fffa000) { /* 0.84375 <= |x| < 1.25 */ - s = fabsl (x) - one; + s = fabsl(x) - 1.0; P = pa[0] + s * (pa[1] + s * (pa[2] + s * (pa[3] + s * (pa[4] + s * (pa[5] + s * (pa[6] + s * pa[7])))))); Q = qa[0] + s * (qa[1] + s * (qa[2] + @@ -283,11 +280,11 @@ long double erfl(long double x) } if (ix >= 0x4001d555) { /* inf > |x| >= 6.6666259765625 */ if ((se & 0x8000) == 0) - return one - tiny; - return tiny - one; + return 1.0 - tiny; + return tiny - 1.0; } x = fabsl (x); - s = one / (x * x); + s = 1.0 / (x * x); if (ix < 0x4000b6db) { /* 1.25 <= |x| < 2.85711669921875 ~ 1/.35 */ R = ra[0] + s * (ra[1] + s * (ra[2] + s * (ra[3] + s * (ra[4] + s * (ra[5] + s * (ra[6] + s * (ra[7] + s * ra[8]))))))); @@ -305,8 +302,8 @@ long double erfl(long double x) SET_LDOUBLE_WORDS(z, i, i0, i1); r = expl(-z * z - 0.5625) * expl((z - x) * (z + x) + R / S); if ((se & 0x8000) == 0) - return one - r / x; - return r / x - one; + return 1.0 - r / x; + return r / x - 1.0; } long double erfcl(long double x) @@ -315,16 +312,16 @@ long double erfcl(long double x) long double R, S, P, Q, s, y, z, r; uint32_t se, i0, i1; - GET_LDOUBLE_WORDS (se, i0, i1, x); + GET_LDOUBLE_WORDS(se, i0, i1, x); ix = se & 0x7fff; if (ix >= 0x7fff) { /* erfc(nan) = nan, erfc(+-inf) = 0,2 */ - return (long double)(((se & 0xffff) >> 15) << 1) + one / x; + return (long double)(((se & 0xffff) >> 15) << 1) + 1.0 / x; } ix = (ix << 16) | (i0 >> 16); if (ix < 0x3ffed800) { /* |x| < 0.84375 */ if (ix < 0x3fbe0000) /* |x| < 2**-65 */ - return one - x; + return 1.0 - x; z = x * x; r = pp[0] + z * (pp[1] + z * (pp[2] + z * (pp[3] + z * (pp[4] + z * pp[5])))); @@ -332,27 +329,27 @@ long double erfcl(long double x) z * (qq[2] + z * (qq[3] + z * (qq[4] + z * (qq[5] + z))))); y = r / s; if (ix < 0x3ffd8000) /* x < 1/4 */ - return one - (x + x * y); + return 1.0 - (x + x * y); r = x * y; - r += x - half; - return half - r; + r += x - 0.5L; + return 0.5L - r; } if (ix < 0x3fffa000) { /* 0.84375 <= |x| < 1.25 */ - s = fabsl (x) - one; + s = fabsl(x) - 1.0; P = pa[0] + s * (pa[1] + s * (pa[2] + s * (pa[3] + s * (pa[4] + s * (pa[5] + s * (pa[6] + s * pa[7])))))); Q = qa[0] + s * (qa[1] + s * (qa[2] + s * (qa[3] + s * (qa[4] + s * (qa[5] + s * (qa[6] + s)))))); if ((se & 0x8000) == 0) { - z = one - erx; + z = 1.0 - erx; return z - P / Q; } z = erx + P / Q; - return one + z; + return 1.0 + z; } if (ix < 0x4005d600) { /* |x| < 107 */ - x = fabsl (x); - s = one / (x * x); + x = fabsl(x); + s = 1.0 / (x * x); if (ix < 0x4000b6db) { /* 1.25 <= |x| < 2.85711669921875 ~ 1/.35 */ R = ra[0] + s * (ra[1] + s * (ra[2] + s * (ra[3] + s * (ra[4] + s * (ra[5] + s * (ra[6] + s * (ra[7] + s * ra[8]))))))); @@ -365,26 +362,25 @@ long double erfcl(long double x) s * (sb[5] + s * (sb[6] + s)))))); } else { /* 107 > |x| >= 6.666 */ if (se & 0x8000) - return two - tiny;/* x < -6.666 */ + return 2.0 - tiny;/* x < -6.666 */ R = rc[0] + s * (rc[1] + s * (rc[2] + s * (rc[3] + s * (rc[4] + s * rc[5])))); S = sc[0] + s * (sc[1] + s * (sc[2] + s * (sc[3] + s * (sc[4] + s)))); } z = x; - GET_LDOUBLE_WORDS (hx, i0, i1, z); + GET_LDOUBLE_WORDS(hx, i0, i1, z); i1 = 0; i0 &= 0xffffff00; - SET_LDOUBLE_WORDS (z, hx, i0, i1); - r = expl (-z * z - 0.5625) * - expl ((z - x) * (z + x) + R / S); + SET_LDOUBLE_WORDS(z, hx, i0, i1); + r = expl(-z * z - 0.5625) * expl((z - x) * (z + x) + R / S); if ((se & 0x8000) == 0) return r / x; - return two - r / x; + return 2.0 - r / x; } if ((se & 0x8000) == 0) return tiny * tiny; - return two - tiny; + return 2.0 - tiny; } #endif |